X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Focaml%2Fcic%2FcicUtil.ml;h=1c5d603caffcaa61b78ee158fc1235ae01f643b7;hb=ac7687ce66526f905874ed99a845223c853c558a;hp=a8195a311079922607949411fb77add571e8a2cb;hpb=fb3367a180abd237b4096fe398178dd14b994f6d;p=helm.git

diff --git a/helm/ocaml/cic/cicUtil.ml b/helm/ocaml/cic/cicUtil.ml
index a8195a311..1c5d603ca 100644
--- a/helm/ocaml/cic/cicUtil.ml
+++ b/helm/ocaml/cic/cicUtil.ml
@@ -24,9 +24,139 @@
  *)
 
 exception Meta_not_found of int
+exception Subst_not_found of int
+
 
 let lookup_meta index metasenv =
   try
     List.find (fun (index', _, _) -> index = index') metasenv
   with Not_found -> raise (Meta_not_found index)
 
+let lookup_subst n subst =
+  try
+    List.assoc n subst
+  with Not_found -> raise (Subst_not_found n)
+
+let exists_meta index = List.exists (fun (index', _, _) -> (index = index'))
+
+(* clean_up_meta take a substitution, a metasenv a meta_inex and a local
+context l and clean up l with respect to the hidden hipothesis in the 
+canonical context *)
+
+let clean_up_local_context subst metasenv n l =
+  let cc =
+    (try
+       let (cc,_,_) = lookup_subst n subst in cc
+     with Subst_not_found _ ->
+       try
+	 let (_,cc,_) = lookup_meta n metasenv in cc
+       with Meta_not_found _ -> assert false) in
+  (try 
+     List.map2
+       (fun t1 t2 ->
+	  match t1,t2 with 
+	      None , _ -> None
+	    | _ , t -> t) cc l
+   with 
+       Invalid_argument _ -> assert false)
+
+let is_closed =
+ let module C = Cic in
+ let rec is_closed k =
+  function
+      C.Rel m when m > k -> false
+    | C.Rel m -> true
+    | C.Meta (_,l) ->
+       List.fold_left
+        (fun i t -> i && (match t with None -> true | Some t -> is_closed k t)
+        ) true l
+    | C.Sort _ -> true
+    | C.Implicit _ -> assert false
+    | C.Cast (te,ty) -> is_closed k te && is_closed k ty
+    | C.Prod (name,so,dest) -> is_closed k so && is_closed (k+1) dest
+    | C.Lambda (_,so,dest) -> is_closed k so && is_closed (k+1) dest
+    | C.LetIn (_,so,dest) -> is_closed k so && is_closed (k+1) dest
+    | C.Appl l ->
+       List.fold_right (fun x i -> i && is_closed k x) l true
+    | C.Var (_,exp_named_subst)
+    | C.Const (_,exp_named_subst)
+    | C.MutInd (_,_,exp_named_subst)
+    | C.MutConstruct (_,_,_,exp_named_subst) ->
+       List.fold_right (fun (_,x) i -> i && is_closed k x)
+        exp_named_subst true
+    | C.MutCase (_,_,out,te,pl) ->
+       is_closed k out && is_closed k te &&
+        List.fold_right (fun x i -> i && is_closed k x) pl true
+    | C.Fix (_,fl) ->
+       let len = List.length fl in
+        let k_plus_len = k + len in
+         List.fold_right
+          (fun (_,_,ty,bo) i -> i && is_closed k ty && is_closed k_plus_len bo
+          ) fl true
+    | C.CoFix (_,fl) ->
+       let len = List.length fl in
+        let k_plus_len = k + len in
+         List.fold_right
+          (fun (_,ty,bo) i -> i && is_closed k ty && is_closed k_plus_len bo
+          ) fl true
+in 
+ is_closed 0
+;;
+
+let rec is_meta_closed =
+  function
+      Cic.Rel _ -> true
+    | Cic.Meta _ -> false
+    | Cic.Sort _ -> true
+    | Cic.Implicit _ -> assert false
+    | Cic.Cast (te,ty) -> is_meta_closed te && is_meta_closed ty
+    | Cic.Prod (name,so,dest) -> is_meta_closed so && is_meta_closed dest
+    | Cic.Lambda (_,so,dest) -> is_meta_closed so && is_meta_closed dest
+    | Cic.LetIn (_,so,dest) -> is_meta_closed so && is_meta_closed dest
+    | Cic.Appl l ->
+       List.fold_right (fun x i -> i && is_meta_closed x) l true
+    | Cic.Var (_,exp_named_subst)
+    | Cic.Const (_,exp_named_subst)
+    | Cic.MutInd (_,_,exp_named_subst)
+    | Cic.MutConstruct (_,_,_,exp_named_subst) ->
+       List.fold_right (fun (_,x) i -> i && is_meta_closed x)
+        exp_named_subst true
+    | Cic.MutCase (_,_,out,te,pl) ->
+       is_meta_closed out && is_meta_closed te &&
+        List.fold_right (fun x i -> i && is_meta_closed x) pl true
+    | Cic.Fix (_,fl) ->
+        List.fold_right
+          (fun (_,_,ty,bo) i -> i && is_meta_closed ty && is_meta_closed bo
+          ) fl true
+    | Cic.CoFix (_,fl) ->
+         List.fold_right
+          (fun (_,ty,bo) i -> i && is_meta_closed ty && is_meta_closed bo
+          ) fl true
+;;
+
+let xpointer_RE = Str.regexp "\\([^#]+\\)#xpointer(\\(.*\\))"
+let slash_RE = Str.regexp "/"
+
+let term_of_uri s =
+  let uri = UriManager.uri_of_string s in
+  try
+    (if String.sub s (String.length s - 4) 4 = ".con" then
+      Cic.Const (uri, [])
+    else if String.sub s (String.length s - 4) 4 = ".var" then
+      Cic.Var (uri, [])
+    else if not (Str.string_match xpointer_RE s 0) then
+      raise (UriManager.IllFormedUri s)
+    else
+      let (baseuri,xpointer) = (Str.matched_group 1 s, Str.matched_group 2 s) in
+      let baseuri = UriManager.uri_of_string baseuri in
+      (match Str.split slash_RE xpointer with
+      | [_; tyno] -> Cic.MutInd (baseuri, int_of_string tyno - 1, [])
+      | [_; tyno; consno] ->
+          Cic.MutConstruct
+            (baseuri, int_of_string tyno - 1, int_of_string consno, [])
+      | _ -> raise Exit))
+  with
+  | Exit
+  | Failure _
+  | Not_found -> raise (UriManager.IllFormedUri s)
+